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Search Results: 1 - 10 of 10673 matches for " Simon Berry "
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Connectivity in Bag Generation
Arturo Trujillo,Simon Berry
Computer Science , 1996,
Abstract: This paper presents a pruning technique which can be used to reduce the number of paths searched in rule-based bag generators of the type proposed by \cite{poznanskietal95} and \cite{popowich95}. Pruning the search space in these generators is important given the computational cost of bag generation. The technique relies on a connectivity constraint between the semantic indices associated with each lexical sign in a bag. Testing the algorithm on a range of sentences shows reductions in the generation time and the number of edges constructed.
Management of post cholecystectomy Mirizzi′s syndrome
Janes Simon,Berry L,Dijkstra B
Journal of Minimal Access Surgery , 2005,
Abstract: Various strategies have been proposed for the management of retained calculi within the biliary tree following cholecystectomy. We present a unique case of a cystic duct remnant calculus causing Mirizzi syndrome, only the fourth such case of its kind. An open procedure was planned, however the calculus was eventually extracted endoscopically. The pathophysiology and management of Mirizzi syndrome and retained calculi within the cystic duct remnant are discussed along with the merits of a minimally invasive approach.
The spectrum of random lifts
Louigi Addario-Berry,Simon Griffiths
Mathematics , 2010,
Abstract: For a fixed d-regular graph H, a random n-lift is obtained by replacing each vertex v of H by a "fibre" containing n vertices, then placing a uniformly random matching between fibres corresponding to adjacent vertices of H. We show that with extremely high probability, all eigenvalues of the lift that are not eigenvalues of H, have order O(sqrt(d)). In particular, if H is Ramanujan then its n-lift is with high probability nearly Ramanujan. We also show that any exceptionally large eigenvalues of the n-lift that are not eigenvalues of H, are overwhelmingly likely to have been caused by a dense subgraph of size O(|E(H)|).
Invasion percolation on the Poisson-weighted infinite tree
Louigi Addario-Berry,Simon Griffiths,Ross J. Kang
Mathematics , 2009, DOI: 10.1214/11-AAP761
Abstract: We study invasion percolation on Aldous' Poisson-weighted infinite tree, and derive two distinct Markovian representations of the resulting process. One of these is the $\sigma\to\infty$ limit of a representation discovered by Angel et al. [Ann. Appl. Probab. 36 (2008) 420-466]. We also introduce an exploration process of a randomly weighted Poisson incipient infinite cluster. The dynamics of the new process are much more straightforward to describe than those of invasion percolation, but it turns out that the two processes have extremely similar behavior. Finally, we introduce two new "stationary" representations of the Poisson incipient infinite cluster as random graphs on $\mathbb {Z}$ which are, in particular, factors of a homogeneous Poisson point process on the upper half-plane $\mathbb {R}\times[0,\infty)$.
Genetics of animal health and disease in cattle
Donagh P Berry, Mairead L Bermingham, Margaret Good, Simon J More
Irish Veterinary Journal , 2011, DOI: 10.1186/2046-0481-64-5
Abstract: There continues to be very significant advances in efforts to control disease in cattle, with the potential for significant improvements to both performance and welfare. These advances have included improved understanding of disease pathophysiology and epidemiology, as well as the development of products such as antibiotics and anthelmintics for improved disease control.Concurrently, there have been considerable advances in animal breeding and genetics, relevant to animal disease control. These advances are of considerable veterinary interest, noting that observed animal performance is the outcome of the interaction between the animal's genetic makeup and the specific environment it was exposed to. Logically, therefore, improved genetics has the potential to complement current approaches to animal disease control. Improvement in animal health through genetic selection is advantageous, because genetic gain is cumulative and permanent, as the genes introduced into a population can persist for many generations. Unravelling the genetic architecture of health and disease resistance not only facilitates knowledge development on potential for breeding for improved health status but also generates knowledge for biomedical research in animals and humans including applications such as vaccine development.The objective of this review is to summarise research studies on the genetics of animal health and disease resistance in cattle, with particular reference to studies undertaken in Irish cattle. The implications of these results in breeding for improved animal health and disease resistance are discussed.Prior to discussing the genetics of animal health and disease resistance, the terms commonly used by animal breeders to describe the characteristics of a population need to be explained:The phenotype is simply the observed performance of an animal "in the field" (e.g., dystocia in cows or the presence or absence of infection as measured by a positive or negative diagnostic test
Inference on gravitational waves from coalescences of stellar-mass compact objects and intermediate-mass black holes
Carl-Johan Haster,Zhilu Wang,Christopher P. L. Berry,Simon Stevenson,John Veitch,Ilya Mandel
Physics , 2015,
Abstract: Gravitational waves from coalescences of neutron stars or stellar-mass black holes into intermediate-mass black holes (IMBHs) of $\gtrsim 100$ solar masses represent one of the exciting possible sources for advanced gravitational-wave detectors. These sources can provide definitive evidence for the existence of IMBHs, probe globular-cluster dynamics, and potentially serve as tests of general relativity. We analyse the accuracy with which we can measure the masses and spins of the IMBH and its companion in intermediate-mass ratio coalescences. We find that we can identify an IMBH with a mass above $100 ~ M_\odot$ with $95\%$ confidence provided the massive body exceeds $130 ~ M_\odot$. For source masses above $\sim200 ~ M_\odot$, the best measured parameter is the frequency of the quasi-normal ringdown. Consequently, the total mass is measured better than the chirp mass for massive binaries, but the total mass is still partly degenerate with spin, which cannot be accurately measured. Low-frequency detector sensitivity is particularly important for massive sources, since sensitivity to the inspiral phase is critical for measuring the mass of the stellar-mass companion. We show that we can accurately infer source parameters for cosmologically redshifted signals by applying appropriate corrections. We investigate the impact of uncertainty in the model gravitational waveforms and conclude that our main results are likely robust to systematics.
Sub-Optimal Generation Portfolio Variance with Rate of Return Regulation  [PDF]
Stanley Keith Berry
Technology and Investment (TI) , 2010, DOI: 10.4236/ti.2010.12014
Abstract: This paper demonstrates that continuation of traditional rate-of-return electric utility regulation of transmission and distribution assets will impede the ability of customers to optimize their generation portfolios. Under linear price regulation, with increasing (decreasing) returns to scale customers will choose a more (less) risky generation portfolio than they would with no transmission and distribution asset rate-of-return regulation. Similar problems arise under non-linear (two-part) pricing of transmission and distribution assets. When the per-unit price is set at marginal cost, with increasing (decreasing) marginal cost, customers will choose a more (less) risky generation portfolio than they would with no transmission and distribution asset regulation. With price caps the optimal generation portfolio is chosen.
HCN1 and HCN2 in Rat DRG Neurons: Levels in Nociceptors and Non-Nociceptors, NT3-Dependence and Influence of CFA-Induced Skin Inflammation on HCN2 and NT3 Expression
Cristian Acosta, Simon McMullan, Laiche Djouhri, Linlin Gao, Roger Watkins, Carol Berry, Katherine Dempsey, Sally N. Lawson
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050442
Abstract: Ih, which influences neuronal excitability, has recently been measured in vivo in sensory neuron subtypes in dorsal root ganglia (DRGs). However, expression levels of HCN (hyperpolarization-activated cyclic nucleotide-gated) channel proteins that underlie Ih were unknown. We therefore examined immunostaining of the most abundant isoforms in DRGs, HCN1 and HCN2 in these neuron subtypes. This immunostaining was cytoplasmic and membrane-associated (ring). Ring-staining for both isoforms was in neurofilament-rich A-fiber neurons, but not in small neurofilament-poor C-fiber neurons, although some C-neurons showed cytoplasmic HCN2 staining. We recorded intracellularly from DRG neurons in vivo, determined their sensory properties (nociceptive or low-threshold-mechanoreceptive, LTM) and conduction velocities (CVs). We then injected fluorescent dye enabling subsequent immunostaining. For each dye-injected neuron, ring- and cytoplasmic-immunointensities were determined relative to maximum ring-immunointensity. Both HCN1- and HCN2-ring-immunointensities were positively correlated with CV in both nociceptors and LTMs; they were high in Aβ-nociceptors and Aα/β-LTMs. High HCN1 and HCN2 levels in Aα/β-neurons may, via Ih, influence normal non-painful (e.g. touch and proprioceptive) sensations as well as nociception and pain. HCN2-, not HCN1-, ring-intensities were higher in muscle spindle afferents (MSAs) than in all other neurons. The previously reported very high Ih in MSAs may relate to their very high HCN2. In normal C-nociceptors, low HCN1 and HCN2 were consistent with their low/undetectable Ih. In some C-LTMs HCN2-intensities were higher than in C-nociceptors. Together, HCN1 and HCN2 expressions reflect previously reported Ih magnitudes and properties in neuronal subgroups, suggesting these isoforms underlie Ih in DRG neurons. Expression of both isoforms was NT3-dependent in cultured DRG neurons. HCN2-immunostaining in small neurons increased 1 day after cutaneous inflammation (CFA-induced) and recovered by 4 days. This could contribute to acute inflammatory pain. HCN2-immunostaining in large neurons decreased 4 days after CFA, when NT3 was decreased in the DRG. Thus HCN2-expression control differs between large and small neurons.
?COLOMBIA ENCONTRó POR FIN UNA REFORMA AGRARIA QUE FUNCIONE?
Berry,Albert;
Revista de Economía Institucional , 2002,
Abstract: this article assesses colombian agrarian reforms from the beginning of the 20th century. it shows the positive and negative effects of law 200 of 1936, criticizes the impact of incora in land distribution in the seventies and the failure of ?campesino? organizations that sought pacific agrarian reforms. the essay highlights the positive effects of dri on ?campesino? income but recognizes its negative effects on social inequality. also, it argues that the adoption of free market policies in the nineties deteriorated rural conditions and social inequality. finally, it evaluates the scope of recent projects and offers some policy recommendations.
The Pedagogic Grammarian's Dilemma: Modality and Personality in Grammatical Description
Roger Berry
Studia Anglica Posnaniensia , 2009, DOI: 10.2478/v10121-009-0008-3
Abstract: This paper investigates an issue that I call the "pedagogic grammarian's dilemma": the choice facing writers of pedagogic grammars between being specific about grammar and risking being wrong, or hedging and risking being vague, as formulated by Henry Widdowson (1997). Using two corpora of grammatical description, it examines how a number of exponents of modality are used to hedge and finds firstly that they are far more common than in ordinary text. More importantly there is a link between the use of such modality and the approach to personality chosen in the grammars: hedging is more common when the more friendly YOU is used to address users than when WE is used; this suggests an interpersonal (as well as epistemic) motivation for the hedging. Overall the response of the grammars studied to the pedagogic grammarian's dilemma is to hedge, in order, it seems, to avoid being prescriptive.
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